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F2 is to enter the BIOS. If the arrow keys are not working in the BIOS I would suspect more than low voltage on the CMOS battery (although it could still be bad) as the regular PC power is working at that point. Can you connect a USB keyboard and try that?

If I were to open the PC to check the battery voltage I would just go ahead and replace the battery. Its a major task to replace the CR2032 battery as the main board has to be removed.

Now back to the sound problem. HDMI audio is only if you have an HDMI cable attached to a TV or some other device that uses HDMI for audio. Otherwise the "Speakers" should be set as the default playback device. What "horrible" sound??

I will do this System Specs thing ( if I can) but am told to first " contact my application publisher ( ???) for instructions about obtaining the appropriate version of the Net Framework.
I will have to fill in manually as I don'use Internet Explorer ( hate it ).

You are really helping me enormously, because on all the places I search for answers to my problem, they talk about cables, and I not't use a cable. This baffled me. I just look at old TV things on Y Tube. As I said, the noise changed from just very good to very bad in one second while watching a video on Y TUBE.

I went in my sound devices and it noted " Digital Audio (HDMI) is unplugged." It did not mention cables and so I took it that it was put out of order and that it is something I need to have good sound on from my laptop.

It is from end 2010 but been absolutely fabulous ! What this poor thing has been through with me you would not believe and I have ( up till now) never been to a computer specialist and paid for helping me out.

One thread was on about changing things in the BIOS ( on a Y TUBE video which I cannot understand proper because of the bad sound), but I managed to put down the changes he suggested on paper. Also many people where helped by this (in the comments). The arrows work in F8 or F12 but NOT in F2, very frustrating.

So now you think I do not need the HDMI at all and it is a speaker problem ?

I will do this System Specs thing ( if I can) but am told to first " contact my application publisher ( ???) for instructions about obtaining the appropriate version of the Net Framework.
I will have to fill in manually as I don'use Internet Explorer ( hate it ).

Personally I like HW Info see my little ditty if we need to know what components are needed this will give those in great detail.Using HW Info PART A:You can test the volts on the PSU with HW Info HWiNFO, HWiNFO32/64 - Download < download the right bit version and close the right hand window select Sensors and scroll down to the power section where you will see what the volts are doing see my pic. In my pic the section (Nuvoton) with VBATT is a dead give away you are in the section for the rail voltages. There are other section titles and one that pops up often is ITENow the voltage on the different rails have to be within 5% =+/- of what is required or the machine will not work properly if at all. See this for the rail voltage info http://www.tomshardware.com/reviews/power-supply-specifications-atx-reference,3061.html (Section 2.) The original right hand window shows the machine running and is handy for that but for looking at the components in some detail close it and use the main left hand side panelFOR OTHER COMPONENTSPART B: Open each small square with + in it on the section the components are in and then click on the individual component/s (it will highlight in blue) - in the right hand side will appear all sorts of details including brands speeds and other essential info that particular device. See pic for example.

Use PART B: see pic for an example and again for an example open out the audio andsee what the device is using

Now they ( Windows) want me to download KB 976932, that is yonkes old.. that is dead worrying !
Because it mentions HDMI, I tried to download it .... and it failed, why do they suggest it to me now ????

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